Step 1: Concept A copper converter (typically the Peirce-Smith type) oxidizes the sulphur and iron from the copper matte.
Step 2: Meaning The vessel is a horizontal cylinder that can be rotated for charging and pouring.
Step 3: Analysis In these horizontal converters, air is introduced through a row of pipes called tuyeres.
Step 4: Conclusion These tuyeres are located along the side of the horizontal vessel, making side-blowing the standard method.
Final Answer: (C)